Songs and games are two ways to teach vowel and consonant sounds to children. The sites TeachWithMe.com and BoyMamaTeacherMama.com offer several resources to help children learn.
Teach With Me provides a link to a song called the "Vowel Song," which is set to the tune of "B-I-N-G-O." The site also suggests playing speed games with children to help them with memorizing vowels and consonants and to prepare them for taking timed tests when they're older.
Boy Mama Teacher Mama also suggests teaching through games. The site offers templates for a game that helps children learn by having them sort consonants and vowels into separate piles.